// Use a BorderLayout layout manager to arrange various Box components
this.setLayout(new BorderLayout());
// Give the entire panel a margin by adding an empty border
// We could also do this by overriding getInsets()
this.setBorder(new EmptyBorder(10,10,10,10));
// Add a plain row of buttons along the top of the pane
Box row = Box.createHorizontalBox();
for(int i = 0; i < 4; i++) {
JButton b = new JButton("B" + i);
b.setFont(new Font("serif", Font.BOLD, 12+i*2));
row.add(b);
}
this.add(row, BorderLayout.NORTH);
// Add a plain column of buttons along the right edge
// Use BoxLayout with a different kind of Swing container
// Give the column a border: can't do this with the Box class
JPanel col = new JPanel();
col.setLayout(new BoxLayout(col, BoxLayout.Y_AXIS));
col.setBorder(new TitledBorder(new EtchedBorder(), "Column"));
for(int i = 0; i < 4; i++) {
JButton b = new JButton("Button " + i);
b.setFont(new Font("sanserif", Font.BOLD, 10+i*2));
col.add(b);
}
this.add(col, BorderLayout.EAST); // Add column to right of panel
// Add a button box along the bottom of the panel.
// Use "Glue" to space the buttons evenly
Box buttonbox = Box.createHorizontalBox();
buttonbox.add(Box.createHorizontalGlue()); // stretchy space
buttonbox.add(new JButton("Okay"));
buttonbox.add(Box.createHorizontalGlue()); // stretchy space
buttonbox.add(new JButton("Cancel"));
buttonbox.add(Box.createHorizontalGlue()); // stretchy space
buttonbox.add(new JButton("Help"));
buttonbox.add(Box.createHorizontalGlue()); // stretchy space
this.add(buttonbox, BorderLayout.SOUTH);
// Create a component to display in the center of the panel
JTextArea textarea = new JTextArea();
textarea.setText("This component has 12-pixel margins on left and top"+
" and has 72-pixel margins on right and bottom.");
textarea.setLineWrap(true);
textarea.setWrapStyleWord(true);
// Use Box objects to give the JTextArea an unusual spacing
// First, create a column with 3 kids. The first and last kids
// are rigid spaces. The middle kid is the text area
Box fixedcol = Box.createVerticalBox();
fixedcol.add(Box.createVerticalStrut(12)); // 12 rigid pixels
fixedcol.add(textarea); // Component fills in the rest
fixedcol.add(Box.createVerticalStrut(72)); // 72 rigid pixels
// Now create a row. Give it rigid spaces on the left and right,
// and put the column from above in the middle.
Box fixedrow = Box.createHorizontalBox();
fixedrow.add(Box.createHorizontalStrut(12));
fixedrow.add(fixedcol);
fixedrow.add(Box.createHorizontalStrut(72));
// Now add the JTextArea in the column in the row to the panel
this.add(fixedrow, BorderLayout.CENTER);
